56bfc75949
"pos" now returns 1 if the argument is greater than 0, otherwise it returns 0. This is consistent with the common mathematical definition of the "pos" function: https://en.wikipedia.org/wiki/Sign_(mathematics) However the previous implementation in which 1 was also returned for a 0 argument is useful in many situations so the "pos0" has been added which returns 1 if the argument is greater or equal to 0. Additionally the "neg0" has been added which returns 1 if if the argument is less than or equal to 0.
94 lines
2.7 KiB
C
94 lines
2.7 KiB
C
/*---------------------------------------------------------------------------*\
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========= |
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\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
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\\ / O peration |
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\\ / A nd | Copyright (C) 2011-2017 OpenFOAM Foundation
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\\/ M anipulation |
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-------------------------------------------------------------------------------
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License
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This file is part of OpenFOAM.
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OpenFOAM is free software: you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with OpenFOAM. If not, see <http://www.gnu.org/licenses/>.
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\*---------------------------------------------------------------------------*/
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#include "SyamlalOBrien.H"
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#include "phasePair.H"
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#include "addToRunTimeSelectionTable.H"
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// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
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namespace Foam
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{
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namespace dragModels
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{
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defineTypeNameAndDebug(SyamlalOBrien, 0);
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addToRunTimeSelectionTable(dragModel, SyamlalOBrien, dictionary);
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}
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}
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// * * * * * * * * * * * * * * * * Constructors * * * * * * * * * * * * * * //
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Foam::dragModels::SyamlalOBrien::SyamlalOBrien
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(
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const dictionary& dict,
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const phasePair& pair,
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const bool registerObject
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)
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:
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dragModel(dict, pair, registerObject)
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{}
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// * * * * * * * * * * * * * * * * Destructor * * * * * * * * * * * * * * * //
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Foam::dragModels::SyamlalOBrien::~SyamlalOBrien()
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{}
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// * * * * * * * * * * * * * * * Member Functions * * * * * * * * * * * * * //
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Foam::tmp<Foam::volScalarField> Foam::dragModels::SyamlalOBrien::CdRe() const
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{
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volScalarField alpha2
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(
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max(scalar(1) - pair_.dispersed(), pair_.continuous().residualAlpha())
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);
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volScalarField A(pow(alpha2, 4.14));
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volScalarField B
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(
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neg(alpha2 - 0.85)*(0.8*pow(alpha2, 1.28))
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+ pos0(alpha2 - 0.85)*(pow(alpha2, 2.65))
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);
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volScalarField Re(pair_.Re());
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volScalarField Vr
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(
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0.5
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*(
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A - 0.06*Re + sqrt(sqr(0.06*Re) + 0.12*Re*(2.0*B - A) + sqr(A))
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)
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);
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volScalarField CdsRe(sqr(0.63*sqrt(Re) + 4.8*sqrt(Vr)));
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return
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CdsRe
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*max(pair_.continuous(), pair_.continuous().residualAlpha())
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/sqr(Vr);
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}
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// ************************************************************************* //
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